Metallic packing for piston-heads



(No Model.)

J.A.BURNs. METALLIG PAGKING FOR PISTON HEADS.

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JOHN A. BURNS, OF ALLEGHENY, PENNSYLVANIA.

METALLlC PACKING FOR PISTON-'HEDS.

SPECIFICATION forming' part of Letters Patent No. 584,539, dated June15, 1897.

Application filed (Inne 10, 1896. Serial No. 594,895. (No modelJ To allwhom it mety corwci'vt;

Be it known that 1, JOHN A. BURNS, a citizen of the United States,residing at Alleghcny,|` in the county of Allegheny, State ofPennsylvania, have invented certain new and useful Improvements inMetallic Packing for Piston- Heads; and I hereby declare the followingto be a full, clear, and exact description of the invention, such aswill enable others skilled in the art to which it pertains to make anduse the same, reference being had to the accompanying drawings, whichform a part of this specification, in which- Figure l indicates alongitudinal elevation, partly in section, of the piston-rod, bull-ring,springs, andfollowers- Fig. 2 is an elevation of piston and head. Fig. 3isa plan view of the piston-head. Fig. 4 is a side elevation of thespring-ring. Fig. 5 is a sectional ele- Vation of the same. Fig. 6 is anenlarged View of a portion of the spring-ring where the adjacentseparable ends are connected. Fig. 7 is a plan View of the bull-ring.Fig. S is a side elevation, partly in section, of the same. Fg. 9 is aplan View of the follower. Fig. 10 is a section through the center ofthe same.

' My invention relates to ineta'llic pistonpacking adapted lto beregulated partly by the elasticity of the same and partly by thepressure of the steam, the object of my in- Vention being to produce asimple and eilicient packing applicable to any ordinary pistonhead or tothe bull-ring thereon, and to this purpose consists of the novelconstruction and arrangement of parts hereinafter described, referencebeing had to the accompanying drawings, forrning part hereof, in lwhichlike numerals indicate like parts wherever they occnr.

Referring to said drawings, l and 2 are respectively pis-ton-rod andpiston-head, which are of the usual construction.

3 is a bull-ring of the usual construction, secured in any suitablemanner upon said piston-head between the follower 4., which is bolted orotherwise secured to said head, and the inner end of said piston-head,as shown in Fig. 1.

5 5 are `flat metallic spring-rings adapted to be seated in the annularrecesses 6 6, formed between the bull-ring and the inner end of thepiston-head and the follower. Said spring- `rings are provided with aseries of recesses or chambers 7 7, the sides of which are inclined, orthey may be V-shaped. They are likewise provided with a series of smallopenings 8 8, extending from said chambers in the front ring toward thefront and in the chambers of the back ring toward the rear, for theadmission of steam and oil into said grooves or chambers. The pressureof the steam within said chambers not only serves to regulate thedistention of said rings and the consequent impingement of the sameagainst the sides of the cylinder, but with the oil enterng saidchambers with the steam lubricates said packing. The separable ends ofsaid rings terminate in respectively Shoulders 10 10 and the tongu'es10', the end of either tongue being adapt-ed to abut or seat itselfagainst the Shoulders formed in the opposite end of the ring, as shownin Fig. 6. Said rings are larger when distended than the inner diameterof the cylinder and are compressed somewhat in order to enter thecylinder, the elasticity of the spring causing them to impinge tightlyagainst the cylinder. The friction of said springs upon the sides of thecylinder is graduated and adjusted by the pressure of the steam admittedto the recesses or chambers in said Springs. Said openings 8 8 are alsofor the purpose of enahling the steam admitted into the chambers orrecesses to exhaust therethrough.

The upwardly-projecting portion 11 of the bull-ring is provided with arecess 12, in which Babbitt or other suitable metal packing may beinserted.

The operation of my improvement is as follows, Viz: The rings being adjusted up in the piston-head, as shown, said piston-head forces the sameforward and enters the chambers or grooves in the rear ring through thesmall openings therein, the pressure whereof serves to contract saidrings, if too widely distended, and lessen the friction of the sameagainst the inner sides of the cylinder on the reverse stroke. The outerspring-'ring on the head is operated upon in a similar manner by thesteam, the steam acting upon the rear spring-ring being at this strokepermitted to exhaust, and thus decrease the friction of said inner ringupon the cylinder side.

Having described my invention, what I claim, and desire to Secure byLetters Patent, 1S'

1. The combination with the piston, bullring, and follower, of one ormore scparable fiat spring-rings, each of which is integral thronghontand of greater diameter when distended than the cylinder; said ringsbeing compressed and seated in the recess formed between the bull-ringand follower, and having a series of chambers in the outer periphery ofthe same; the sides or edges of said rings having a number I of smallopenings oornniunicating With said chambers and the cylinder,snbstantially as and for the purpose herein described.

2. A metallio packing for piston-heads, comprisin g one or more fiatseparable springof two Witnesses.

JOHN A. BURNS. In presenoe of- GEORGE D. EDWARDS, O. A. WILLIAMS.

